Kameda is the second eldest of the three Kameda brothers, which is Japan's most famous boxing family. In 2007, the Osaka-born Daiki said he would commit seppuku if he lost to WBC flyweight champ Daisuke Naito.

During the bout, Kameda (pictured, then with dyed blonde hair) began elbowing and body slamming Naito out of frustration. Kameda lost and was banned from professional boxing for one year because of his fight conduct. He did not commit seppuku after the fight. His father, who was his trainer, had his license revoked and stepped down as his trainer.